RU2263840C2 - Vibration mechanism for high-moment variator - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: mechanism comprises control handle, driving and driven shafts mounted in the bearings of the housing, and device for converting rotation of the driving shaft into vibration rotation of the driven shaft, with vibration amplitude being changed by means of the control handle. The device has intermediate vibration shaft that is mounted in the bearing inside the housing and provided with the eccentrically mounted ball bearing and connected with the driving shaft for permitting rotation vibration with a constant amplitude, plank with the slot mounted in the ball bearing and pivotally connected with the housing, and bushing set in the slots of the driven shaft and provided with the pin mounted in the slot of the plank. The control handle is kinematically connected with the bushing for permitting movement of the driven shaft along the bushing.

EFFECT: simplified structure and reduced cost.

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Description

The present invention relates to mechanical engineering and is intended to convert the rotation of the drive shaft into an oscillatory driven shaft with a continuously variable amplitude, which can be used in high-torque variators, hydraulic machines and other devices.

Known oscillatory mechanisms with a continuously variable amplitude of the driven shaft, for example a linkage mechanism [1], which is quite bulky and dynamically unbalanced. Vibration mechanisms used in high-torque variators, for example [3, 4], use translationally moved carriages, which complicates the design of the variator.

We take for the prototype the closest oscillator mechanism [2], which is closest in technical essence and the achieved result, containing a control handle, drive and driven shafts mounted on the bearings of the housing, as well as a device for converting the unidirectional rotation of the drive shaft into oscillatory rotation of the driven shaft with the possibility of changing the amplitude control handle oscillation, which includes an inclined crank pivotally connected to the drive shaft and mounted on the trunnions of the driven shaft with a variable from the control handle phenomena angle of nutation.

Signs of a known mechanism (prototype), coinciding with the claimed invention, are as follows. The known mechanism comprises a control handle mounted on the bearings of the housing drive and driven shafts, as well as a device for converting the unidirectional rotation of the drive shaft into oscillatory rotation of the driven shaft with the possibility of changing the amplitude of the oscillation from the control handle.

The known mechanism has a complex and heavily loaded kinematic connection of the control handle with an inclined crank. The moment necessary to change the angle of nutation is comparable to the working moment on the driven shaft.

The purpose of the invention is to increase operational characteristics, simplify and reduce the cost of construction.

The proposed oscillatory mechanism has the following essential features. It contains a control handle, drive and driven shafts mounted on the bearings of the housing, as well as a device for converting the unidirectional rotation of the drive shaft into oscillatory rotation of the driven shaft with the possibility of changing the vibration amplitude from the control handle, including mounted on the bearings of the housing with an eccentrically mounted spherical bearing and connected with a drive shaft with the ability to oscillate with constant amplitude, an intermediate oscillating shaft installed in a spherical bearing and a slot with a slot pivotally connected to the housing, as well as a sleeve mounted on the slots of the driven shaft with a finger placed in the slot of the strip, the control handle is kinematically connected with the sleeve with the possibility of moving it along the driven shaft.

Distinctive features of the prototype features of the invention are the following. The proposed high-torque variator mechanism is equipped with a spherical bearing mounted on bearings of the housing with an eccentrically mounted spherical bearing and connected to the drive shaft with the possibility of oscillating rotation with constant amplitude by an intermediate vibrational shaft mounted in a spherical bearing and a slot with a slot pivotally connected to the housing, as well as a slave mounted on the slots of the follower shaft sleeve with a finger placed in the slot of the strap, while the control handle is kinematically connected with the sleeve with a possible by moving it along the driven shaft.

Figures 1 and 2 give a general view of the oscillatory mechanism, Fig. 3 is a calculated kinematic diagram, Figs. 4 and 5 are examples of the drive of an intermediate oscillatory shaft, Figs. variable displacement pump.

The proposed mechanism (Figs. 1 and 2) comprises a housing 1, a drive 2 and a driven 3 shafts mounted on the bearings of the housing, an intermediate vibrational shaft 4, on the trunnions 5 of which an inclined crank 6 is mounted, connected by a spherical joint 7 to the drive shaft 2. On the intermediate vibrational a spherical bearing 8 is eccentrically mounted to the shaft 4, and a bar 10 is mounted on the ball bearing 9 in the housing, inserted by its cylindrical end 11 into the spherical bearing 8. A sleeve 13 with a pin 14 forming a rotator is installed on the splines 12 of the driven shaft 3 th pair with the biscuit 15 placed in a groove 16 bar. The sleeve 13 with its groove 17 interacts with the tap 18, forming a screw-nut pair with a screw 19, on which the control handle 20 is fixed, while the groove 21 made in the housing fixes the tap from turning.

The oscillatory mechanism works as follows (Fig.1-3). When the drive shaft 2 rotates, the intermediate shaft 4 oscillates with a constant amplitude β, the spherical bearing 8 moves the cylindrical end 11 of the bar 10, the bar rotates the sleeve 13 and, therefore, the driven shaft, which oscillates with an amplitude θ. The amplitude θ can be changed from zero to θ _max on the working mechanism by rotating the control handle 20, which, moving the layering, moves finger 14 along the groove of the bar, z is the coordinate of the center of the sleeve (0≤z≤z _max ), L is the distance between the centers of the spheres A and C.

Denoting K = z / L, we have a forced change of the amplitude of the oscillation of the driven shaft 0 and the working length of the finger r as a function of K (figure 3):

θ = arctan [(Ksinβ) / (1-K + Kcosβ)];

r = 0 _B B ₁ = R (1-K + Kcosβ) (1 + tg ² θ) ^0.5 ,

where R = 0 _A А = 0 _C С. θ = 0 takes place at z = 0, and the maximum amplitude θ _max - at z _max .

The proposed mechanism is fully statically balanced when several carousel-symmetrically mounted strips 10 are used in the design, since the center of mass of the working mechanism in this case remains stationary, and the dynamic moment arising due to variable angular velocity on the driven shaft 3 is applied to this shaft and, therefore not transmitted to the housing.

The design of the drive of the intermediate oscillating shaft 4 may differ from that shown in figure 1. The drive may be cam (figure 4), where the shaft 4 is equipped with rollers 22, interacting with the cams 23 mounted on the drive shaft 2. Figure 5 shows the crank-lever drive, where the drive shaft 2 is made by an earring 24 connected to the shaft 4 and connected to the shaft 4 .

An example of using the proposed oscillatory mechanism in a high-torque variator is shown in Fig.6. The variator uses two oscillatory mechanisms operating with a relative phase shift of 90 ° from the input shaft of the variator 25 with gear 26 coupled to the gears 27 fixed to the drive shafts 2.

The variator contains two rectifiers, each of which has a pair of overrunning clutches 28, with leading half couplings mounted on the driven shaft 3, and the driven half couplings with bevel gears 29 are connected to the intermediate shaft 30 by means of gear 31. The rectifier gear 32, capable of performing unidirectional, serves as the output link of the rectifier. rotation during oscillatory rotation of the driven shaft 3.

The variator also contains a three-shaft differential, a pair of shafts 33 of which are made with a gear wheel 34 and a bevel gear 35, coupled respectively to the gear of the rectifier 32 and with the satellite 36, mounted on the carrier 37, which is mounted on the third shaft of the differential 38, which is the output shaft of the high-torque variator.

Changing the gear ratio of the variator is carried out by changing the amplitude θ of the oscillation of the driven shafts 3. The proposed design of the variator allows for high uniformity of rotation of the output shaft through the use of a three-shaft differential [3, 4], as well as non-circular wheels 25 and 27 [5].

7 and 8 show the use of the proposed oscillatory mechanism for driving a volumetric pump with a continuously variable feed.

The pump comprises a housing 39 with a pair of blades 40 and a pair of blades 41, which are mounted on the driven shaft 3 of the oscillating mechanism, forming extruded volumes q and g, which are connected by a low pressure pipe 42 to a tank 43, 44 - a high pressure pipe. During the half-turn of the drive shaft (Fig. 8), the displaced volumes q are reduced, and the working fluid from them flows into the pipe 44, and the displaced volumes g are connected to the tank 43, after another half-turn, the displaced volumes change their functions to the opposite. The change in the pump flow is carried out by changing the amplitude θ of the oscillation of the driven shaft 3.

Sources of information

1. Maltsev V.F. Mechanical impulse transmissions. - 3rd ed. - M.: Mechanical Engineering. 1978, p. 51, fig. 7.

2. RF patent №2207463 C2, F 16 N 23/04, The mechanism with a swash plate. / Author: B. Pylaev Prior. 03/06/2001.

3. RF patent No. 2204749 C1, F 16 H 29/08, High-torque variator. / Author: Pylaev B.V. Prior. 11/05/2001.

4. German patent No. 3309044, F 16 H 29/08. Stufenlos regelbares, mechanisches Schaltwerksgetribe / Anmelder. Rindfleisch B. - Anmeldetag: 03/14/1983.

5. RF patent №2179673 C1, F 16 Н 29/08, High-torque variator. / Author: B. Pylaev Prior. 07/03/2000.

Claims (1)

Oscillating mechanism of a high-torque variator, containing a control handle, drive and driven shafts mounted on the bearings of the housing, as well as a device for converting the unidirectional rotation of the drive shaft into vibrational rotation of the driven shaft with the possibility of changing the vibration amplitude from the control handle, characterized in that it is equipped with bearings an eccentrically mounted spherical bearing and connected to the drive shaft with the ability to oscillate from a constant position hydrochloric amplitude intermediate oscillating shaft mounted in a spherical bearing and is pivotally connected to the body strap with a slot, and planted splined driven shaft sleeve with placed in the slot strap finger, wherein the control handle is kinematically linked to the sleeve to move it along the driven shaft.

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